GB1240854A - Improvements relating to high voltage electrical insulators - Google Patents

Improvements relating to high voltage electrical insulators

Info

Publication number
GB1240854A
GB1240854A GB4603868A GB4603868A GB1240854A GB 1240854 A GB1240854 A GB 1240854A GB 4603868 A GB4603868 A GB 4603868A GB 4603868 A GB4603868 A GB 4603868A GB 1240854 A GB1240854 A GB 1240854A
Authority
GB
United Kingdom
Prior art keywords
insulator
resistance
tracking
current
milliamperes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4603868A
Inventor
Marcus William Astle-Fletcher
Leslie John Giles
Joseph Kenneth Hill
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Railways Board
Original Assignee
British Railways Board
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Railways Board filed Critical British Railways Board
Priority to GB4603868A priority Critical patent/GB1240854A/en
Publication of GB1240854A publication Critical patent/GB1240854A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/50—Insulators or insulating bodies characterised by their form with surfaces specially treated for preserving insulating properties, e.g. for protection against moisture, dirt, or the like

Landscapes

  • Insulators (AREA)
  • Insulating Bodies (AREA)

Abstract

1,240,854. Insulators with finite surface resistance. BRITISH RAILWAYS BOARD. 4 Dec., 1969 [27 Sept., 1968], No. 46038/68. Heading H2C. A synthetic plastics insulator has finite surface resistance provided by a continuous sheet coating forming its outer surface. The value of resistance is chosen to be such that under polluted conditions insulator leakages of 7 milliamperes and less are carried conductively in the surface of the insulator where the pollution is absent or non-conductive, so that surface tracking is inhibited. It is stated that tracking is insignificant for insulator leakage currents greater than 7 milliamperes. The surface resistance may be provided by resin mixed with antimony doped tin oxide. A formula is given relating the minimum current for which tracking is to be permitted to the current in the surface of the unpolluted insulator for a given voltage across it, and from the latter current the required resistance of the surface can be calculated. A correction can be made if the surface resistivity is dependent on the voltage stress in the surface.
GB4603868A 1968-09-27 1968-09-27 Improvements relating to high voltage electrical insulators Expired GB1240854A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4603868A GB1240854A (en) 1968-09-27 1968-09-27 Improvements relating to high voltage electrical insulators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4603868A GB1240854A (en) 1968-09-27 1968-09-27 Improvements relating to high voltage electrical insulators

Publications (1)

Publication Number Publication Date
GB1240854A true GB1240854A (en) 1971-07-28

Family

ID=10439590

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4603868A Expired GB1240854A (en) 1968-09-27 1968-09-27 Improvements relating to high voltage electrical insulators

Country Status (1)

Country Link
GB (1) GB1240854A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2545259A1 (en) * 1983-04-29 1984-11-02 Ceraver ELECTRIC INSULATOR HAVING AN IMPROVED INSENSITIVITY TO POLLUTION

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2545259A1 (en) * 1983-04-29 1984-11-02 Ceraver ELECTRIC INSULATOR HAVING AN IMPROVED INSENSITIVITY TO POLLUTION
EP0126984A1 (en) * 1983-04-29 1984-12-05 CERAVER Société anonyme dite: Electrical insulator having an insensitivity to pollution

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